Figure 77- - uploaded by Jaafar A Mohammed
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Schematic diagrams of shielded TBMs. a) Slurry machine; bentonite slurry is pumped to plenum chamber and mixes with spoil cut at the face. Mixture is removed for separation and treatment before recycling. b) Principles of EPBM. Cut soil (with additives as necessary) is removed by a screw device with the pressures monitored and maintained. c) Single-shield rock TBM. Rock cut from the face is mucked out and TBM pushes forward against the liner erected to the rear of the shield. Other rock TBMs use grippers pushed against the walls of the tunnel and use this as the reaction force for advancing the TBM.
Source publication
The foundation supporting a civil engineering structure is the most important element of the structure, and will have an effect on the quality, safety and construction costs of the project. Usually, the geotechnical properties of the foundations are determined through engineering geological surveys and ground investigations, prior to construction a...
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